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30 July 1999 <br /> AGE-NC Project No 95-0143 <br /> IPage 2 of 8 <br /> 22 TRENCHING SOIL DISPOSAL <br /> I <br /> On 07 May 1999, soil stockpiled during trenching and not used for backfill material was transported <br /> off-site for disposal Approximately 80 cubic yards of soil was transported to 619 South 9`' Street <br /> in Modesto for use as backfill material Approximately 130 cubic yards was transported to 3932 <br /> Newton Road for use in site grading Transport of the soil was approved by the PHS-EHD <br /> I (Appendix A -PHS-EHD letter) <br /> 23 DRILLING AND SAMPLING <br /> From 14 to 21 April 1999, 28 soil borings were advanced at the site Borings SWI through SW4 <br /> were advanced at an angle of 25° from vertical, boring SW21 was drilled at an angle of 15° from <br /> vertical,boring V W5 was drilled at an angle of 20°from vertical Borings S W 1 through S W23 were <br /> I drilled to a vertical depth of approximately 3 8 feet below surface grade (bsg), borings VW 1 through <br /> V W5 were drilled to a vertical depth of 25 feet All borings were advanced using CME-75 drill rigs <br /> equipped with 8-inch diameter hollow-stem augers The drill rigs and two-man crews were supplied <br /> by Mitchell Drilling Environmental Corp (MDE) of Rancho Cordova, California Auger returns <br /> generated by drilling were segregated based upon field indications of the presence of hydrocarbons <br /> and stockpiled on-site Boring locations are shown on Figure 3 <br /> Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- <br /> cleaned 2-inch by 6-inch brass sleeves The samples were collected at five-foot intervals, beginning <br /> Iat depths from 5 feet bsg to 25 feet bsg, using a 140-pound hammer to advance the sampler 18 <br /> inches The number of blows required to advance the sampler in 6-inch increments was recorded on <br /> the boring logs <br /> I All sampling tools and <br /> p g sample liners used for sample collection were thoroughly rinsed with clean <br /> I water after washing with a solution of Alconox between each sampling run to avoid cross- <br /> contamination For each sample, both ends of the leading sleeve were covered with Teflon sheets, <br /> capped and sealed with tape <br />' Grab water samples were collected from borings SW4, SW9, SWI 1, SW20 and SW23 during <br /> drilling by lowering a new disposable bailer through the augers Upon retrieval, the samples were <br /> I transferred into 40-mI EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative <br /> Soil and water samples were labeled, stored on ice and transported under chain-of-custody to <br /> McCampbell Analytical Inc (MAI) in Pacheco, a California Department of Health Services (DHS)- <br /> certified analytical laboratory <br /> I <br /> Adraâ–ºrced GeoEmironmental,Inc <br />